Mozilla firefox geckodriver fix.

Author: Zygimantas Rukas

CHANGELOG.md

@@ -5,6 +5,9 @@ This project versioning adheres to [Semantic Versioning](http://semver.org/).
 
 ---
 
+### Fixed
+- Mozilla firefox geckodriver fix. ([PHPUnit\Framework\Exception] Undefined index: ELEMENT)
+
 ## 1.6.0 - 2018-05-16
 ### Added
 - Connection and request timeouts could be specified also when creating RemoteWebDriver from existing session ID.

lib/Remote/RemoteWebDriver.php

@@ -187,7 +187,7 @@ public function findElement(WebDriverBy $by)
             $params
         );
 
-        return $this->newElement($raw_element['ELEMENT']);
+        return $this->newElement($raw_element['ELEMENT'] ?? $raw_element[\key($raw_element)]);
     }
 
     /**
@@ -207,7 +207,7 @@ public function findElements(WebDriverBy $by)
 
         $elements = [];
         foreach ($raw_elements as $raw_element) {
-            $elements[] = $this->newElement($raw_element['ELEMENT']);
+            $elements[] = $this->newElement($raw_element['ELEMENT'] ?? $raw_element[\key($raw_element)]);
         }
 
         return $elements;